Time duration calculator
Start + duration → end; or add/subtract hh:mm:ss. Handles past-midnight.
Ready
How it works
Parses hh:mm:ss (hours may exceed 24). Adds the duration to the start time; if the result passes midnight the next day, it reports +1 day.
Works for shift math, video lengths, and batch-job estimates. Not a timezone-aware scheduler.
Examples
09:30 + 08:45:30 = 18:15:30 23:30 + 01:00 = 00:30 (+1 day)
FAQ
Can I type just 90 minutes? Not directly — use 01:30:00 or 00:90:00 is not standard; use 01:30:00.
Negative duration? Not supported in add mode; switch to date-difference for spans.
Timezone? None. This is wall-clock arithmetic only.
Decimal hours? Convert in the unit-converter or hours-minutes calculator.
Uploaded? No.